| GPCR | G protein-coupled receptor |
| GRK | G protein-coupled receptor kinase |
| β2AR | β2-adrenergic receptor |
| M2R | Mucraninic acetylcholine receptor 2 |
| NTS1R | Neurotensin receptor 1 |
| TM | Transmembrane helix |
| ICL ECL |
Intracellular loop Extracellular loop |
| JNK | c-Jun N-terminal kinase |
| EPR | Electron paramagnetic resonance |
| NMR | Nuclear magnetic resonance |
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